//package com.hmall.gateway.filters;
//
//import com.hmall.common.exception.UnauthorizedException;
//import com.hmall.gateway.config.AuthProperties;
//import com.hmall.gateway.util.JwtTool;
//import lombok.RequiredArgsConstructor;
//import org.springframework.cloud.gateway.filter.GatewayFilterChain;
//import org.springframework.cloud.gateway.filter.GlobalFilter;
//import org.springframework.core.Ordered;
//import org.springframework.http.HttpStatus;
//import org.springframework.http.server.reactive.ServerHttpRequest;
//import org.springframework.http.server.reactive.ServerHttpResponse;
//import org.springframework.stereotype.Component;
//import org.springframework.util.AntPathMatcher;
//import org.springframework.web.server.ServerWebExchange;
//import reactor.core.publisher.Mono;
//
//import java.util.List;
//
//@Component
//@RequiredArgsConstructor
//public class AuthGlobalFilter implements GlobalFilter , Ordered {
//    private final AuthProperties authProperties;
//    private final JwtTool jwtTool;
//    private final AntPathMatcher antPathMatcher = new AntPathMatcher();
//    @Override
//    public Mono<Void> filter(ServerWebExchange exchange, GatewayFilterChain chain) {
//        //获取请求头
//        ServerHttpRequest request = exchange.getRequest();
//        //判断是否需要拦截
//        if(isExclude(request.getPath().toString())){
//            return chain.filter(exchange);
//        }
//        //获取认证信息与token
//        String token = null;
//
//        List<String> authorization = request.getHeaders().get("authorization");
//        if (authorization != null && !authorization.isEmpty()) {
//            token = authorization.get(0);
//        }
//        Long userId =null;
//        // 校验并解析token
//        try {
//             userId = jwtTool.parseToken(token);
//        }catch (UnauthorizedException e){
//            //未登录状态显示 避免笼统返回500  此处返回401
//            ServerHttpResponse response = exchange.getResponse();
//            response.setStatusCode(HttpStatus.UNAUTHORIZED);
//            return response.setComplete();
//        }
//
//        //打印
//        System.out.println("userId is :"+ userId);
//        //放行 由于优先级大于netty哪个filter netty通过exchange整合 所以userid 传递到微服务了
//        return chain.filter(exchange);
//    }
//
//    @Override
//    public int getOrder() {
//        return 0;
//    }
//
//    Boolean isExclude(String path){
//        List<String> excludePaths = authProperties.getExcludePaths();
//        for (String excludePath : excludePaths) {
//            if( antPathMatcher.match(excludePath, path)){
//                return true;
//            }
//        }
//        return false;
//    }
//}
package com.hmall.gateway.filters;

import com.hmall.common.exception.UnauthorizedException;
import com.hmall.gateway.config.AuthProperties;
import com.hmall.gateway.util.JwtTool;
import lombok.RequiredArgsConstructor;
import org.springframework.cloud.gateway.filter.GatewayFilterChain;
import org.springframework.cloud.gateway.filter.GlobalFilter;
import org.springframework.core.Ordered;
import org.springframework.http.HttpStatus;
import org.springframework.http.server.reactive.ServerHttpRequest;
import org.springframework.http.server.reactive.ServerHttpResponse;
import org.springframework.stereotype.Component;
import org.springframework.util.AntPathMatcher;
import org.springframework.web.server.ServerWebExchange;
import reactor.core.publisher.Mono;

import java.util.List;


@Component
@RequiredArgsConstructor
public class AuthGlobalFilter implements GlobalFilter, Ordered {

    private final AuthProperties authProperties;

    private final JwtTool jwtTool;

    private final AntPathMatcher antPathMatcher = new AntPathMatcher();

    @Override
    public Mono<Void> filter(ServerWebExchange exchange, GatewayFilterChain chain) {
        //1、获取request
        ServerHttpRequest request = exchange.getRequest();
        //2、判断是否需要做登录拦截
        if(isExclude(request.getPath().toString())){
            // 无需拦截，直接放行
            return chain.filter(exchange);
        }
        //3、获取token
        String token = null;
        List<String> headers = request.getHeaders().get("authorization");
        if (headers != null && !headers.isEmpty()) {
            token = headers.get(0);
        }
        //4、校验并解析token
        Long userId = null;
        try {
            userId = jwtTool.parseToken(token);
        } catch (UnauthorizedException e) {
            // 如果无效，拦截
            ServerHttpResponse response = exchange.getResponse();
            response.setStatusCode(HttpStatus.UNAUTHORIZED);
            return response.setComplete();
        }
        // 5、传递用户信息
        String userInfo = userId.toString();
        ServerWebExchange swe = exchange.mutate().
                request(builder -> builder.header("user-info", userInfo))
                .build();
//        String userInfo = userId.toString();
//        ServerWebExchange swe = exchange.mutate()
//                .request(builder -> builder.header("user-info", userInfo))
//                .build();
//        System.out.println("userId = " + userId);
        //6、放行
        return chain.filter(swe);
    }

    private boolean isExclude(String path) {
        for (String pathPattern : authProperties.getExcludePaths()) {
            if(antPathMatcher.match(pathPattern, path)){
                return true;
            }
        }
        return false;
    }

    @Override
    public int getOrder() {
        return 0;
    }
}
